Two brass filar micrometers from a telescope and a brass divided object glass
Royal Astronomical Society
RAS Reference Number
Other Reference Number
RAS/S/No.3(2 micrometers marked)
Two brass (with glass optics) filar micrometers from a telescope (part 1 and 2) and a brass divided object glass (part 3). Additionally there is a wooden carrying case (with hinged lid).
Sheepshanks, Richard 1794-1855